Re: self-alignment-X on DynamicTextSpanner?

[Jean Abou Samra]

Le 30/01/2022 à 22:20, Simon Albrecht a écrit :
> Hi List,
>
> is there an equivalent to self-alignment-X for the left bound text of 
> a DynamicTextSpanner? See below.
>
> Best, Simon
>
> \version "2.23.5"
>
> {
>   1-\tweak self-alignment-X 1 \fff
>   1
>   % this causes alignment to just fail indiscriminately
>   % (not a surprise, because I couldn’t find out how to use this 
> property)
>   %-\tweak left-bound-info.self-alignment-X 0
>   % this is simply an offset against the default placement (default 
> #'(-.75 . -.5))
>   %-\tweak bound-details.left.stencil-offset #'(-3 . 0)
>   % I’m not sure what this does at all
>   %-\tweak bound-details.left.attach-dir -3
>   \cresc
>   1
>   1
>   1
>   1\!
> }


To explain the behavior with left-bound-info: this is an
internal property that gets populated with values from
bound-details and values computed automatically.  If you
override a subproperty, since callbacks aren't supported
for subproperties, you just override the calculation of
this property from bound-details and logic, and there
is nothing in it but the suboverride you have done.
Then it's not surprising that everything starts going
wrong.

To answer the question: attach-dir is the equivalent of
parent-alignment-X, controlling where on the note head
(left, center, right, intermediate values) the reference
point of the text goes.  There is no direct equivalent
for self-alignment-X, but you can do

\version "2.22.1"

{
  1-\tweak self-alignment-X 1 \fff
  1\tweak bound-details.left.text \markup \general-align #X #0 "cresc." 
\cresc
  1
  1
  1
  1\!
}


Best regards,
Jean